iOS之WiFi IP相关

• Questions

  在[iOS实现WIFI传书]中有一个获取IP的步骤
  在此顺带总结一份关于WIFI与IP的常用内容

  1. 设备网络IP地址
  2. WiFi信息
  3. 路由器地址
  4. 本机DNS服务器
  5. 手机的网络IP地址
  6. 进入WiFi设置

• Code

  • 设备网络IP地址

  // 获取设备网络Ip地址
  + (NSString *)deviceNetIp {
      int sockfd =socket(AF_INET,SOCK_DGRAM,0);
      // if (sockfd < 0) return nil;
      NSMutableArray *ips = [NSMutableArray array];
      int BUFFERSIZE = 4096;
      struct ifconf ifc;
      char buffer[BUFFERSIZE], *ptr, lastname[IFNAMSIZ], *cptr;
      struct ifreq *ifr, ifrcopy;
      ifc.ifc_len= BUFFERSIZE;
      ifc.ifc_buf= buffer;
      if(ioctl(sockfd, SIOCGIFCONF, &ifc) >= 0){
          for(ptr = buffer; ptr < buffer + ifc.ifc_len; ){
              ifr = (struct ifreq*)ptr;
              int len =sizeof(struct sockaddr);
              if(ifr->ifr_addr.sa_len > len) {
                  len = ifr->ifr_addr.sa_len;
              }
              ptr +=sizeof(ifr->ifr_name) + len;
              if(ifr->ifr_addr.sa_family != AF_INET)
                  continue;
              if((cptr = (char*)strchr(ifr->ifr_name,':')) != NULL)
                  *cptr =0;
              if(strncmp(lastname, ifr->ifr_name, IFNAMSIZ) == 0)
                  continue;
              memcpy(lastname, ifr->ifr_name, IFNAMSIZ);
              ifrcopy = *ifr;
              ioctl(sockfd, SIOCGIFFLAGS, &ifrcopy);
              if((ifrcopy.ifr_flags&IFF_UP) == 0)
                  continue;
              NSString *ip = [NSString stringWithFormat:@"%s", inet_ntoa(((struct sockaddr_in*)&ifr->ifr_addr)->sin_addr)];
              [ips addObject:ip];
          }
      }
      close(sockfd);
      NSString *deviceIP = @"";
      for(int i = 0; i < ips.count; i++) {
          if(ips.count > 0) {
              deviceIP = [NSString stringWithFormat:@"%@", ips.lastObject];
          }
      }
      return deviceIP;
  }

  • WiFi信息

  /*
   * 获取wifi信息
   * iOS12以上的版本获取wifi信息，需在中设Capability置Access WIFI Infomation = ON
   * iOS13获取之前需获判断是否同意app适用地理位置信息
   */
  - (void)wifi:(void(^)(NSDictionary *sender))handler {
      if (@available(iOS 13.0, *)) {
          if ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusDenied) {
              // 设置定位权限
              [[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString] options:@{} completionHandler:nil];
          } else if ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusNotDetermined) {
              self.manager = [[CLLocationManager alloc] init];
              self.manager.delegate = self;
              [self.manager requestWhenInUseAuthorization];
              self.wifiBlock = handler;
          } else {
              [self fetchWifi:handler];
          }
      } else {
          [self fetchWifi:handler];
      }
  }
  - (void)fetchWifi:(void(^)(NSDictionary *sender))handler {
      NSArray *interfaceNames = CFBridgingRelease(CNCopySupportedInterfaces());
      NSDictionary *SSIDInfo;
      for (NSString *interfaceName in interfaceNames) {
          SSIDInfo = CFBridgingRelease(CNCopyCurrentNetworkInfo((__bridge CFStringRef)interfaceName));
          BOOL isNotEmpty = (SSIDInfo.count > 0);
          if (isNotEmpty) {
              break;
          }
      }
      // ssid信息 即wifi名称
      NSString *ssid = [SSIDInfo objectForKey:@"SSID"];
      // bssid信息 即mac地址
      NSString *bssid = [SSIDInfo objectForKey:@"BSSID"];
      NSLog(@"ssid = %@, mac地址 = %@", ssid, bssid);
      if (handler) {
          handler(SSIDInfo);
      }
  }
  

  • 路由器信息

  + (NSString *)routerIp {
      NSString *address = @"error";
      struct ifaddrs *interfaces = NULL;
      struct ifaddrs *temp_addr = NULL;
      int success = 0;
      success = getifaddrs(&interfaces);
      if (success == 0) {
          temp_addr = interfaces;
          while(temp_addr != NULL){
              if(temp_addr->ifa_addr->sa_family == AF_INET) {
                  if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {
                      address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
                      NSLog(@"广播地址--%@",[NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_dstaddr)->sin_addr)]);
                      NSLog(@"本机地址--%@",[NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)]);
                      NSLog(@"子网掩码地址--%@",[NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_netmask)->sin_addr)]);
                      NSLog(@"interface--%@",[NSString stringWithUTF8String:temp_addr->ifa_name]);
                  }
              }
              temp_addr = temp_addr->ifa_next;
          }
      }
      
      // Free memory
      freeifaddrs(interfaces);
      
      in_addr_t i = inet_addr([address cStringUsingEncoding:NSUTF8StringEncoding]);
      in_addr_t* x = &i;
      unsigned char *s = getdefaultgateway(x);
      NSString *ip=[NSString stringWithFormat:@"%d.%d.%d.%d",s[0],s[1],s[2],s[3]];
      free(s);
  
      return ip;
  }

  • DNS服务器

  // 获取本机DNS服务器
  + (NSString *)dnsServers {
      res_state res = malloc(sizeof(struct __res_state));
      int result = res_ninit(res);
      NSMutableArray *dnsArray = @[].mutableCopy;
      if ( result == 0 ) {
          for ( int i = 0; i < res->nscount; i++ ) {
              NSString *s = [NSString stringWithUTF8String :  inet_ntoa(res->nsaddr_list[i].sin_addr)];
              [dnsArray addObject:s];
          }
      } else {
          NSLog(@"%@",@" res_init result != 0");
      }
      res_nclose(res);
      return dnsArray.firstObject;
  }

  • 手机的网络IP地址

  + (NSString *)phoneInNetIp {
      BOOL success;
      struct ifaddrs * addrs;
      const struct ifaddrs * cursor;
      success = getifaddrs(&addrs) == 0;
      if (success) {
          cursor = addrs;
          while (cursor != NULL) {
              // the second test keeps from picking up the loopback address
              if (cursor->ifa_addr->sa_family == AF_INET && (cursor->ifa_flags & IFF_LOOPBACK) == 0) {
                  NSString *name = [NSString stringWithUTF8String:cursor->ifa_name];
                  if ([name isEqualToString:@"en0"]) // Wi-Fi adapter
                      NSLog(@"IP:%@",[NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)cursor->ifa_addr)->sin_addr)]);
                  return [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)cursor->ifa_addr)->sin_addr)];
              }
              cursor = cursor->ifa_next;
          }
          freeifaddrs(addrs);
      }
      return nil;
  }

  • WiFi设置

  NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
  if ([[UIApplication sharedApplication] canOpenURL:url]) {
      [[UIApplication sharedApplication] openURL:url options:@{} completionHandler:nil];
  }

• Over

  多说两句：多数时候解决问题需要找思路，一旦确定有解，要实现的就是Code。代码不是最全，网络不少人已贴出来，在此不多写。